A paper plane, paper aeroplane, paper glider, paper airplane or paper dart is a toy plane made out of paper. It is also sometimes called aerogami, after origami (the Japanese art of paper folding). In Japanese, it is called kamihikōki. It is popular in Hawaii because it is one of the easiest types of origami for a novice to master. The most basic paper plane would only take at most six steps to "correctly" complete. The term "paper plane" can also refer to those made from cardboard.
The use of paper airplanes to create toys, is believed to have originated 2,000 years ago in China, where kites were a popular form of entertainment. Leonardo da Vinci is often cited as the inventor of paper planes, although this is debatable since the Chinese invented both paper and the kite. However, he did make reference to building a model plane out of parchment. Arguably the father of model gliders was George Cayley, who built hand-launched kite-like gliders made from linen in the early 1800s. Although these can be considered to be evidence for the modern paper plane, one cannot be sure where exactly the invention originated.
The earliest known date of the creation of modern paper planes was said to have been in 1909. However, the most accepted version of the creation was two decades later in 1930 by Jack Northrop (Co-founder of Lockheed Corporation). Northrop had used paper planes as tests of ideas for flying real-life aircraft.
There have been many improvements in the designs for velocity, lift and fashion over subsequent years
Source: Wikipedia (All text is available under the terms of the GNU Free Documentation License)
For More Information: Build a Paper Plane